ACTIVITY - 0 4
Rolling friction
Aim
: To determine the force of
limiting friction for rolling of a roller (or trolley) on a
horizontal
plane.
Apparatus
: Horizontal plane with pulley, roller ( or trolley), string, rough
balance, slotted weights, pan, weight box.
Diagram :
Procedure :
Note
the weight of trolley and pan using rough balance. Keep
the trolley on the horizontal surface. Tie one end of the string to the hook of
the trolley. Pass
the string over pulley and connect its free end to the pan. Increase the weight
gradually in pan so that trolley will move with uniform slow velocity (without acceleration) on the
horizontal surface. Note the weight in pan. Place the 50 g weight on the trolley and
repeat the above procedure. Take
three reading independently by increasing the weight on trolley by step of 50
g. In each case find the force of limiting friction (P).
Observations :
1) Acceleration due to gravity =
980 cm/s2
2) Weight
of the trolley= W0 = ………………gmwt
3) Weight
of the pan = P0 = ………………gmwt
Observations
table :
|
bs.
No.
|
Weight on the trolley
W1 gmwt
|
Total load
W= (W0 +W1) gmwt
|
Weight in pan
P1 gmwt
|
Total effort
P= (P0 +P1) gmwt
|
|
01
|
|
|
|
|
|
02
|
|
|
|
|
|
03
|
|
|
|
|
Conclusion :
As the weight of trolley increases the effort
increases
ACTIVITY - 0 5
VARIATION OF RANGE WITH ANGLE OF PROJECTION
Aim
: To study the variation in
range of jet of water with angle of projection.
Apparatus : Inclined plane with Protractor, jet of water
/ toy gun
Diagram: Diagram
showing range and height of projectile at different angles .
Procedure : (Initial velocity of
projection “u” should be same)
Fix the jet/toy gun at the
edge of inclined plane.
Adjust the inclined plane
at an angle of 300 with the help of protractor.
Start the water flow or
click the gun.
Measure the range on
horizontal level.
Perform the same for 20°,
45°, 60°, 70°.
Observation Table :
|
Sr
No
|
Angle
of projection
|
Range
of projectile
|
|
1
|
200
|
|
|
2
|
300
|
|
|
3
|
450
|
|
|
4
|
600
|
|
|
5
|
700
|
|
Conclusion :
By changing the angle of
projection, the range of projectile also changes.
Range is maximum for 45°.
Horizontal range is same
for complementary angles.
J K L
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